Michael Loccisano/Getty Images(NEW YORK) -- Three weeks after superstorm Sandy, the odd-even gas rationing has been extended to Friday in New York City.

With nearly a third of the city's gas stations still closed, Mayor Michael Bloomberg says rationing needs to stay in place during the heavy Thanksgiving travel week.

Rationing based on license plate numbers has drastically cut lines at the pump.

Meanwhile, officials in New York City plan to demolish about 200 homes severely damaged by Sandy. In some cases, the danger of collapse is so great the houses will be bulldozed even before the owners are notified. Another 500 homes are now being inspected, and could face razing as well.